Extra generations and discrepancies of electroweak precision data

V. A. Novikov; L. B. Okun; A. N. Rozanov; M. I. Vysotsky

doi:10.1016/S0370-2693(02)01240-6

Extra generations and discrepancies of electroweak precision data

High Energy Physics - Phenomenology 2009-11-07 v3

Authors: V. A. Novikov , L. B. Okun , A. N. Rozanov , M. I. Vysotsky

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Abstract

It is shown that additional chiral generations are not excluded by the latest electroweak precision data if one assumes that there is no mixing with the known three generations. In the case of ``heavy extra generations'', when all four new particles are heavier than $Z$ boson, quality of the fit for the one new generation is as good as for zero new generations (Standard Model). In the case of neutral leptons with masses around 50 GeV (``partially heavy extra generations'') the minimum of $\chi^2$ is between one and two extra generations.

Keywords

gauge boson phenomenology

Cite

@article{arxiv.hep-ph/0111028,
  title  = {Extra generations and discrepancies of electroweak precision data},
  author = {V. A. Novikov and L. B. Okun and A. N. Rozanov and M. I. Vysotsky},
  journal= {arXiv preprint arXiv:hep-ph/0111028},
  year   = {2009}
}

Comments

10 pages, TeX. An additional reference and P.P.S. about heavy higgs are added

Extra generations and discrepancies of electroweak precision data

Abstract

Keywords

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